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High resolution determination of body segment inertial parameters and their variation due to soft tissue motion

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journal contribution
posted on 20.05.2010, 10:42 by Matthew Pain, John H. Challis
This study had two purposes: to evaluate a new method for measuring segmental dimensions for determining body segment inertial parameters (BSIP), and to evaluate the changes in mass distribution within a limb as a consequence of muscular contraction. BSIP were calculated by obtaining surface data points of the body under investigation using a sonic digitizer, interpolating them into a regular grid, and then using Green’s theorem which relates surface to volume integrals. Four skilled operators measured a test object; the error was approximately 2.5% and repeatability was 1.4% (coefficient of variation) in the determination of BSIP. Six operators took repeat measures on human lower legs; coefficients of variation were typically around 5%, and 3% for the more skilled operators. Location of the center of mass of the lower leg was found to move up 1.7 cm proximally when the triceps surae muscles went from a relaxed state to causing plantar flexion. The force during an impact associated with such motion of the soft tissue of the lower leg was estimated to be up to 300 N. In summary, a new repeatable and accurate method for determining BSIP has been developed, and has been used to evaluate body segment mass redistribution due to muscular contraction.

History

School

  • Sport, Exercise and Health Sciences

Citation

PAIN, M.T.G. and CHALLIS, J.H., 2001. High resolution determination of body segment inertial parameters and their variation due to soft tissue motion. Journal of Applied Biomechanics, 17 (4), pp. 326-334

Publisher

© Human Kinetics

Version

AM (Accepted Manuscript)

Publication date

2001

Notes

This article was published in the serial, Journal of Applied Biomechanics [© Human Kinetics]. The definitive version is available at: http://journals.humankinetics.com/JAB

ISSN

1065-8483

Language

en

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